CN103509907B - Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter - Google Patents
Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter Download PDFInfo
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- CN103509907B CN103509907B CN201310508878.1A CN201310508878A CN103509907B CN 103509907 B CN103509907 B CN 103509907B CN 201310508878 A CN201310508878 A CN 201310508878A CN 103509907 B CN103509907 B CN 103509907B
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Abstract
Joining the method for magnesium slag making in a kind of Blowing Converter with unprocessed dolomite: during the dephosphorization and desiliconization of Blowing Converter, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 10 ~ 30kg/ ton steel: when adopting single slag process, disposable unprocessed dolomite to be added; When adopting double slag process, at twice unprocessed dolomite is added; Steel scrap adds according to 135 ~ 150kg/ ton steel; Conveniently enter rear operation.The present invention carries out oxygen top and bottom complex blowing in earlier stage at converter smelting, directly add unprocessed dolomite and carry out slag making, process energy consumption can not only be reduced, and effectively can control converter steelmaking temperature and have more than needed and cause the problem of splash in situation owing to adding a large amount of refrigerant, steel scrap consumption can also be made to reduce, reduce production cost.
Description
Technical field
The present invention relates to the slagging method in a kind of smelting molten steel, belong to a kind of method of joining magnesium slag making in Blowing Converter with unprocessed dolomite particularly.
Background technology
Oxygen top and bottom combined blown converter is a pressure oxygen supply, is removed the process of impurity element and oxidizing reaction heat release raising liquid steel temperature by oxidizing reaction, for alleviating oxidisability slag to the erosion of furnace lining and change slag needs, converter slag-making usually add light dolomite, magnesia dose etc. carry out slag making operation.General converter is all use light dolomite for mainly joining magnesium raw material carries out slag making operation, and unprocessed dolomite is the raw material of production coverter pig light dolomite, and form primarily of calcium carbonate and magnesium carbonate rock, its decomposition reaction is nCaMg (CO
3)
2=MgO+nCaO+ (n+1) CO
2, light dolomite system unprocessed dolomite obtains through calcining and decomposing at nearly 1000 DEG C, and void content and the chemically reactive of light dolomite are higher.
It is believed that and unprocessed dolomite is directly added converter slag-making there is the problem of two aspects: one is think that unprocessed dolomite need first decompose and then participate in reaction, affects slagging speed; Two is think that decomposition reaction is absorbed heat, and cooling effect is high, can make shortage of heat in converter, and being unfavorable for slag, easily causes splash.So converter invention so far, always be select using light dolomite for main as joining magnesium slag making materials.Also have at present and use unprocessed dolomite, but normally at later stage temperature adjustment dry slag or spatter slag condiment dry slag, not for slag making object.
Along with the development of converter steelmaking top and bottom complex blowing technique, air blown converter originally develops into top blown oxygen converter, and converter in-furnace temperature is rich, instead need to add the cooling of a large amount of cold burden.Therefore, through test, find that the cooling effect of unprocessed dolomite controls no longer to become bottleneck to converter temperature, and top and bottom combined blown converter possesses good dynamic conditions, can meet the rapid slagging of unprocessed dolomite completely.Direct use unprocessed dolomite replaces light dolomite, not only can reduce the add-on of cold burden, can also reduce the add-on of steel scrap and this type of refrigerant, effectively controls converter steelmaking temperature and has more than needed and cause the problem of splash in situation owing to adding a large amount of refrigerant.
Now also have and adopt Wingdale to substitute quickened lime slag making, but the quickened lime total amount that normal process one heat steel adds reaches 40-60kg/t usually, if take Wingdale to substitute quickened lime, add-on strengthens, easily cause splash, take Wingdale Some substitute quickened lime then to substitute the determination and wayward to temperature of amount.And the determination of the add-on of unprocessed dolomite joins magnesium demand for foundation calculating with converter, consider its cooling performance simultaneously, and magnesium kept stable is joined in converter, add-on for unprocessed dolomite controls also relatively stable, converter steelmaking process is steady, is especially suitable for adopting the converter of steel-making automatically to include model cootrol in.
Summary of the invention
The object of the invention is to overcome that prior art exists in converter smelting, adds light dolomite join the deficiency that magnesium slag making exists, there is provided a kind of and carry out oxygen top and bottom complex blowing in earlier stage at converter smelting, directly add unprocessed dolomite and carry out slag making, can not only process energy consumption be reduced, and effectively can control converter steelmaking temperature and have more than needed in situation and cause the method for joining magnesium slag making in the Blowing Converter of expulsion problem with unprocessed dolomite owing to adding a large amount of refrigerant.
Realize the measure of above-mentioned purpose:
A method for magnesium slag making is joined with unprocessed dolomite, its step in Blowing Converter:
1) during the dephosphorization and desiliconization of Blowing Converter, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 10 ~ 30kg/ ton steel, concrete feed postition:
When adopting single slag process, disposable unprocessed dolomite to be added;
When adopting double slag process, at twice unprocessed dolomite being added: while just blowing open again, 60 ~ 70% of unprocessed dolomite weight should be added according to ton steel and add, while opening after two slag is blown, adding remaining 40 ~ 30%;
Steel scrap adds according to 135 ~ 150kg/ ton steel;
2) rear operation is conveniently entered.
It is characterized in that: join magnesium situation according to finishing slag, when the unprocessed dolomite added is more than 30kg/ ton steel, exceeds part calcined magnesite ball and substituting as needed.
It is characterized in that: when steel scrap add rear liquid steel temperature present the temperature of relatively tapping setting rich and can not meet the demands time, adopt the refrigerant containing ferric oxide to regulate temperature, its add-on is with till making temperature meet the demands.
It is characterized in that: identical join magnesium rod part under, with the design temperature of tapping for benchmark, when the liquid steel temperature calculated has affluence to spend, unprocessed dolomite as added is no more than 30kg/ ton steel, then all add unprocessed dolomite, if the unprocessed dolomite added is more than 30kg/ ton steel, then exceeds part and adopt calcined magnesite ball to substitute the content requirement causing and meet MgO in slag; When the liquid steel temperature calculated is lower than tapping design temperature, then according to often low 10 DEG C, corresponding minimizing unprocessed dolomite add-on is 5kg/ ton steel, and adds calcined magnesite ball and cause the content requirement meeting MgO in slag.
The present invention compared with prior art, its feature:
One, the present invention uses the raw material of unprocessed dolomite system light dolomite, and directly entering stove does not need calcining, saves the energy.And unprocessed dolomite charging, material loading management are simple, use unprocessed dolomite not have the quality deterioration problems such as light dolomite burning, efflorescence, converter finishing slag controls stable.
Its two, the present invention uses unprocessed dolomite cheap, reduces converter smelting cost.
Its three, the present invention uses small grain size unprocessed dolomite, and quick decomposition reaction, was conducive to controlling suitably low temperature in early stage, promoted dephosphorization in early stage slagging, the CO that unprocessed dolomite decomposites in stove early stage
2can play the effect of enhanced oxygen blowing in early stage, and promote the stirring of slag, it is the highest that unprocessed dolomite decomposes CaO, MgO activity degree generated instantaneously in stove, is also conducive to dephosphorization in early stage.Add early stage and be beneficial to unprocessed dolomite fast decoupled slagging, avoid the blowing middle and later periods to add simultaneously and produce splash or slag bubble.
Its four, the present invention uses unprocessed dolomite to control more to adapt to converter actual thermal equilibrium control for the add-on of refrigerant, effectively can eliminate and add for controlling the rich temperature of converter the problem that a large amount of refrigerant causes splash, stablize kiln process and operate.
Its five, the present invention main joins magnesium, and because the choose opportunities that adds of unprocessed dolomite is adding blowing again early stage, and control add-on at 10 ~ 30kg/ ton steel, make converting process steady, change slag good, finishing slag is suitable.
Its six, unprocessed dolomite of the present invention adds choose opportunities and adds early stage, avoid add splash mid-term, the later stage adds the problems such as slag foamed is serious, the unprocessed dolomite decomposition reaction time is abundant.
Embodiment
Below the present invention is described in detail:
Embodiment 1
The converter of the present embodiment implementation condition: 200t, molten iron temperature is 1300 DEG C, molten iron silicon content 0.3%; According to the steel grade implemented, its tapping temperature is set as 1660 DEG C, and after comprising steel scrap calculating, liquid steel temperature can reach 1690 DEG C, and its temperature affluence degree is 30 DEG C; Require that the content of MgO in slag is 7%, employing be single slag process smelting.
This embodiment unprocessed dolomite joins the method for magnesium slag making, its step:
1) during the dephosphorization and desiliconization of the Blowing Converter of 200 tons, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 20kg/ ton steel and reach and join magnesium requirement;
Owing to adopting single slag process, therefore disposable 20kg/ ton steel unprocessed dolomite to be added; Steel scrap adds according to 140kg/ ton steel; Because liquid steel temperature is comparatively tapped rich 30 DEG C of design temperature, therefore by the refrigerant added containing ferric oxide according to 10kg/ ton steel, temperature is transferred to requirement;
2) rear operation is conveniently entered.
The present embodiment in force, does not produce expulsion problem; Conveniently adopt light dolomite slag making, the steel scrap added should at 155kg/ ton steel, and the present embodiment is 140kg/ ton steel, than employing light dolomite few 15kg/ ton steel steel scrap.
Embodiment 2
The converter of the present embodiment implementation condition: 250t, molten iron temperature is 1305 DEG C, molten iron silicon content 0.35%; According to the steel grade implemented, its tapping temperature is set as 1670 DEG C, and after comprising steel scrap calculating, liquid steel temperature can reach 1680 DEG C, and its temperature affluence degree is 10 DEG C; Require that the content of MgO in slag is 6%, employing be double slag process smelting.
This embodiment unprocessed dolomite joins the method for magnesium slag making, its step:
1) during the dephosphorization and desiliconization of the Blowing Converter of 250 tons, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 29kg/ ton steel;
Owing to adopting double slag process, therefore at twice unprocessed dolomite is added: while just blowing open again, 70% of unprocessed dolomite weight should be added according to ton steel and add, be 20.6kg/ ton steel and add, while opening after two slag is blown, be 8.4kg/ ton steel by remaining 30% and add;
Steel scrap adds according to 145kg/ ton steel;
Because liquid steel temperature is comparatively tapped rich 10 DEG C of design temperature, therefore according to the refrigerant that 7kg/ ton steel adds containing ferric oxide, temperature is transferred to requirement;
2) rear operation is conveniently entered.
The present embodiment in force, does not produce expulsion problem; Conveniently adopt light dolomite slag making, the steel scrap added should at 158kg/ ton steel, and the present embodiment is 145kg/ ton steel, than employing light dolomite few 13kg/ ton steel steel scrap.
Embodiment 3
The converter of the present embodiment implementation condition: 250t, molten iron temperature is 1305 DEG C, molten iron silicon content 0.3%; According to the steel grade implemented, its tapping temperature is set as 1675 DEG C, and after comprising steel scrap calculating, liquid steel temperature can reach 1666 DEG C, and its temperature is low 9 DEG C; Require that the content of MgO in slag is 7%, employing be single slag process smelting.
This embodiment unprocessed dolomite joins the method for magnesium slag making, its step:
1) during the dephosphorization and desiliconization of the Blowing Converter of 250 tons, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 31kg/ ton steel; According to the unprocessed dolomite added not exceed the principle of 30kg/ ton steel, therefore exceed part and adopt light-burned coal briquette to convert to replace, with the content meeting Mg in slag 7% requirement;
Owing to adopting single slag process, therefore disposable the unprocessed dolomite of 30kg/ ton steel and light-burned coal briquette to be added;
Steel scrap adds according to 138kg/ ton steel;
Because liquid steel temperature should be 1666 DEG C, design temperature of comparatively tapping is low 9 DEG C, therefore should according to often reducing by 10 DEG C, corresponding minimizing unprocessed dolomite add-on is the principle of 5kg/ ton steel, the actual unprocessed dolomite added should be 26kg/ ton steel, due to this situation, the content of MgO when can cause slag making in slag does not reach 7%; Therefore add calcined magnesite ball and cause the content requirement meeting MgO in slag; Liquid steel temperature after adding steel scrap in stove reaches requirement, therefore does not need to add the refrigerant containing ferric oxide;
2) rear operation is conveniently entered.
The present embodiment in force, does not produce expulsion problem; Conveniently adopt light dolomite slag making, the steel scrap added should at 152kg/ ton steel, and the present embodiment is 138kg/ ton steel, than employing light dolomite few 14kg/ ton steel steel scrap.
Embodiment 4
The converter of the present embodiment implementation condition: 200t, molten iron temperature is 1305 DEG C, molten iron silicon content 0.45%; According to the steel grade implemented, its tapping temperature is set as 1665 DEG C, and after comprising steel scrap calculating, liquid steel temperature can reach 1680 DEG C, and its temperature affluence degree is 15 DEG C; Require that the content of MgO in slag is 6%, employing be single slag process smelting.
This embodiment unprocessed dolomite joins the method for magnesium slag making, its step:
1) during the dephosphorization and desiliconization of the Blowing Converter of 200 tons, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 25kg/ ton steel;
Owing to adopting single slag process, therefore disposable 25kg/ ton steel unprocessed dolomite to be added; Steel scrap adds according to 136kg/ ton steel; Because liquid steel temperature is comparatively tapped rich 15 DEG C of design temperature, therefore according to the refrigerant that 7kg/ ton steel adds containing ferric oxide, temperature is transferred to requirement;
2) rear operation is conveniently entered.
The present embodiment in force, does not produce expulsion problem; Conveniently adopt light dolomite slag making, the steel scrap added should at 156kg/ ton steel, and the present embodiment is 136kg/ ton steel, than employing light dolomite few 20kg/ ton steel steel scrap.
Embodiment 5
The converter of the present embodiment implementation condition: 200t, molten iron temperature is 1320 DEG C, molten iron silicon content 0.42%; According to the steel grade implemented, its tapping temperature is set as 1675 DEG C, and after comprising steel scrap calculating, liquid steel temperature can reach 1678 DEG C, and its temperature affluence degree is 3 DEG C; Require that the content of MgO in slag is 6.5%, employing be double slag process smelting.
This embodiment unprocessed dolomite joins the method for magnesium slag making, its step:
1) during the dephosphorization and desiliconization of the Blowing Converter of 200 tons, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 35kg/ ton steel; It exceeds the restriction of 30kg/ ton steel, exceed part calcined magnesite ball through conversion after substitute add;
Owing to adopting double slag process, therefore add according to 30kg/ ton steel unprocessed dolomite, unprocessed dolomite is added by twice: while just blowing open again and blowing, 62% of unprocessed dolomite weight should be added according to ton steel to add, be 18.6kg/ ton steel to add, while opening after two slag is blown, be 11.4kg/ ton steel by remaining 38% and add; Calcined magnesite ball after conversion is disposable to add when first time or second time add unprocessed dolomite; Steel scrap adds according to 147kg/ ton steel;
Because liquid steel temperature can meet production requirement with tapping design temperature deviation is little, therefore the refrigerant added containing ferric oxide is not needed to regulate;
2) rear operation is conveniently entered.
The present embodiment in force, does not produce expulsion problem; Conveniently adopt light dolomite slag making, the steel scrap added should at 161kg/ ton steel, and the present embodiment is 147kg/ ton steel, than employing light dolomite few 14kg/ ton steel steel scrap.
The various embodiments described above, do not affect normal employing Wingdale or quickened lime slag making.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. join a method for magnesium slag making in Blowing Converter with unprocessed dolomite, its step:
1) during the dephosphorization and desiliconization of Blowing Converter, add granularity and be 5 ~ 20mm, add unprocessed dolomite according to 20 ~ 30kg/ ton steel, concrete feed postition:
When adopting double slag process, at twice unprocessed dolomite being added: while just blowing open again, 60 ~ 70% of unprocessed dolomite weight should be added according to ton steel and add, while opening after two slag is blown, adding remaining 40 ~ 30%;
Steel scrap adds according to 135 ~ 150kg/ ton steel;
Identical join magnesium rod part under, with the design temperature of tapping for benchmark, when calculating liquid steel temperature and having affluence to spend, unprocessed dolomite as added is no more than 30kg/ ton steel, then all add unprocessed dolomite, if the unprocessed dolomite added is more than 30kg/ ton steel, then exceeds part and adopt calcined magnesite ball to substitute the content requirement causing and meet MgO in slag; When the liquid steel temperature calculated sets lower than tapping temperature, then according to often low 10 DEG C, corresponding minimizing unprocessed dolomite add-on is 5kg/ ton steel, and adds calcined magnesite ball and cause the content requirement meeting MgO in slag;
2) rear operation is conveniently entered.
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| CN201310508878.1A CN103509907B (en) | 2013-10-25 | 2013-10-25 | Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter |
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| CN201310508878.1A CN103509907B (en) | 2013-10-25 | 2013-10-25 | Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter |
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| CN104404193B (en) * | 2014-11-13 | 2016-07-20 | 武汉钢铁(集团)公司 | The method using unprocessed dolomite slag making completely when the semi-automatic steel-making of converter |
| CN104388625B (en) * | 2014-11-13 | 2016-06-08 | 武汉钢铁(集团)公司 | The method that flux consumes is reduced when remained converter slag |
| CN105671237B (en) * | 2016-03-17 | 2018-08-07 | 武钢集团昆明钢铁股份有限公司 | A kind of inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal |
| CN108265150B (en) * | 2018-02-28 | 2019-06-28 | 钢铁研究总院 | A kind of converter high-strength complex blows full raw material slagging method of double slag technique dephosphorization phases |
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| CN103074463A (en) * | 2013-01-04 | 2013-05-01 | 宣化钢铁集团有限责任公司 | Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition |
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| CN103074463A (en) * | 2013-01-04 | 2013-05-01 | 宣化钢铁集团有限责任公司 | Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition |
| CN103352100A (en) * | 2013-07-23 | 2013-10-16 | 山东莱钢永锋钢铁有限公司 | Raw rauhkalk steelmaking method |
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